The Power of HART
Using HART Communication to
Improve Process Operation and Better Manage Plant Assets
Ron Helson
HART Communication Foundation
Austin, TX
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HART is a registered trademark of the HART Communication Foundation
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Things You May Know About HART
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Most smart instruments use
HART Communication
HART smart field devices are
used interchangeably with traditional
4-20mA analog only units
Hand Held Communicators are often used to
perform device set-up, calibration, commissioning
and periodic maintenance functions
PC-based instrument management tools can remotely
communicate with HART devices to manage calibration
and other instrument parameters from central locations
(instrument shop or control room)
HART = Savings in Installation & Maintenance
HART is a registered trademark of the HART Communication Foundation
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Things You May Not Know About HART
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All HART smart devices provide process data for plant
operation continuously - 24/7
HART provides access to all device
data while the 4-20mA analog signal
is
being used for control
Information about the status (health)
of the field device and quality of the
4-20mA signal is part of every message
The Primary Variable is transmitted as a 4-20mA signal
and also as digital value
Many devices have process information (measured or
calculated) in addition to the Primary Variable
This Data is VALUABLE $$$
HART is a registered trademark of the HART Communication Foundation
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HART Basics
4-20 mA
Digital FSK allows additional information
to be carried on the same pair of wires
with the 4-20 mA Analog Signal
Simultaneously and Transparently
HART is a registered trademark of the HART Communication Foundation
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The HART FSK Signal
The Familiarity of 4-20 mA…
with the Benefits of Digital Communication
HART is a registered trademark of the HART Communication Foundation
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Valuable Data
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35-40 data items are
Standard in every HART
device
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Device Information
Basic Calibration
Information
Process Variables
Diagnostic Status Alerts
Use this Data to Improve
Process Operations and
Better Manage Plant
Assets
All Data is easily available
to Plant Systems!
HART is a registered trademark of the HART Communication Foundation
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Digital Process Variables
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Many HART devices support more
than one process measurement or
calculated value
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HART provides access to All Process
Variables in the device
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All Digital Process Variable data
includes:
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IEEE Floating Point Value
Standard Engineering Units Code
Data Quality Status
Primary Variable transmitted on the
4-20mA current loop continuously
HART is a registered trademark of the HART Communication Foundation
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Status & Diagnostic Alerts
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All HART smart field devices continuously
self-assess and monitor their performance
Diagnostic status information is returned
with every message
Status Alerts include quality of 4-20mA
signal and process variable data
Continuous communication increases
integrity of control system information
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Get early warning of device problems
Automatically track and detect changes
in Range or Engineering Units
Validate PV and Loop Current values at control
system with data from the source field device
HART is a registered trademark of the HART Communication Foundation
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Example Applications
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Is the pH electrode cracked or coated?
Has the temperature sensor failed?
Is the measurement accurate?
Is the measurement within range?
Are the impulse lines clogged?
Has the pressure sensor been over-ranged?
Has the device been left in “loop test” position?
Is the air pressure adequate to operate the valve?
Is the control valve operating smoothly over the full range?
Has the device failed or locked-up?
Will the Emergency Shut Down valve operate if required?
Unleash the POWER of HART
HART is a registered trademark of the HART Communication Foundation
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Use HART Full-time
to Unleash the POWER
RELATIVE VALUE
/ Benefits
Savings
/ Benefits
Savings
100%
100%
0%
0%
Commissioning
Troubleshooting
Documentation
Database
Validation
Automated
Records
Partial Value
Diagnostic Alerts for
proactive action
PV Good / Bad status for
improved safety / reliability
Validate accuracy of control
system information
Full access to multi-variable
instrument information
Integrate data with
ERP/CMMS Systems
Value
Gap
$$$
100%
100%
Part-Time
Communication
FULL-TIME Communication
Integrated with Plant Systems
HART is a registered trademark of the HART Communication Foundation
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Getting HART in Plant Systems
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HMI
Engineering
Maintenance
Controller
I/O
H
A
H
R
AT
R
TD
A
DT
AA
T
A
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Cost-effective interfaces support
integration with plant systems
Many control systems offer direct
HART interface and support use of
HART data through-out
Third party products support use
with non-HART capable systems
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Multiplexers - Some integral with FTA
Gateways - HART to Ethernet, HART to
Modbus, HART to Profibus, more...
Single Device Interfaces - Transform
digital process variables and status
alerts into 4-20mA signals and/or
contact closures
HART is a registered trademark of the HART Communication Foundation
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Solutions for HART Integration
HART is a registered trademark of the HART Communication Foundation
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Using HART in Plant Systems
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Continuously Monitor
Device Status & Diagnostics
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Validate Integrity of
Control System Information
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Device Malfunction
Loop Current Fixed
Device Needs Maintenance
Read Loop Current, PV and
Range values from device
Verify accuracy of system data
Ensure scaling factors in system match field device - 20mA & 4mA points
Get Full Value from Multi-Variable devices
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Access Secondary Process Variables for operator display, trending, or control
Use additional process measurements and calculated values to improve plant
operation and manage assets
HART is a registered trademark of the HART Communication Foundation
13
Monitoring HART Smart Valves
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Actual stem position
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Actuator Pressure
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Inside Positioner
Set Point
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Low pressure from clogged filter, leaking connections or torn
diaphragm
Temperature
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Identify sticking or stuck condition, % trim wear, poor response
Target Stem Position
Fugitive Emission Potential
Positioner malfunction
Partial Stroking for ESD Valve testing
Specialized Diagnostic Software Packages
HART is a registered trademark of the HART Communication Foundation
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Single Device HART Interface Solution
SPA uses HART communication to get process variable and
diagnostic data from device and converts information into 420mA signals and/or contact closures
4-20mA Proportional to PV
HART
Field
Device
HART Instrument Fault Alarm
Second Variable (SV) High/Low Alarm
Third Variable (TV) High/Low Alarm
Fourth Variable (FV) High/Low Alarm
4-20mA Proportional to SV, TV, or FV
One Wire from Field to Control Room
Multiple Analog Signals and Alarm Contacts to the Control System
HART is a registered trademark of the HART Communication Foundation
15
Getting HART on Plant Networks
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OPC Server provides easy
access to HART device data
anywhere on plant network
Allows several applications to
access data in a HART device
at the same time
Enables popular HMI and
Trending packages to access
data in HART devices
Connect to one or thousands
of devices using common
HART I/O systems & interfaces
Get HART Data on Your Desktop
HART is a registered trademark of the HART Communication Foundation
HART SERVER
TOOL
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Other Things You Should Know
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HART is Safe, Secure, and Available
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Saves Time and Money
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Install and commission devices in fraction of the time
Enhanced communications and diagnostics reduce maintenance
Low or no additional cost by many suppliers
Improves Plant Operation and Product Quality
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Tested and Accepted global standard
Supported by all major instrumentation manufacturers
Additional process variables and performance indicators
Continuous device status for early detection of warnings
Digital capability ensures easy integration with plant networks
Protects Your Asset Investments
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Compatible with existing instrumentation systems and people
Allows benefits to be achieved incrementally
No need to replace entire system
HART = High VALUE + LOW RISK
HART is a registered trademark of the HART Communication Foundation
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What to Do?
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Identify your HART devices
Provide HART capability training for your staff
Talk with your suppliers about access to your
HART data and providing you with tools to
better use the capability of your HART devices
Use your assets to their fullest…
You
probably are using only a small part of
HARTability
Find Out More!
HART is a registered trademark of the HART Communication Foundation
18
Support for HART Technology
HART
®
COMMUNICATION FOUNDATION
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Provides Worldwide Support for Application of the HART
Communication Technology
Technology Owner and Standards Setting Body for
the HART Protocol
Independent Non-Profit Organization
Funded by Membership and Training/Support
service
fees
Any Company interested in Use of the HART Protocol
should be a member
HART is a registered trademark of the HART Communication Foundation
19
Foundation Services
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Manage and control the HART Protocol
Specifications
Enhance the HART technology
as necessary to support industry
needs for Smart Instrumentation
Provide Training Workshops,
Newsletters, Web Site and other
Services to Educate Industry on
use of the HART Protocol
Manage Library and distribution of Registered
Device Descriptions for HART devices
HART is a registered trademark of the HART Communication Foundation
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The Bottom Line...
Most Users and Suppliers do not use
the full value of HART
The HCF is here to help you
Get More from HART Communication!
HART is a registered trademark of the HART Communication Foundation
21
Questions & Answers
Ron Helson
HART Communication Foundation
9390 Research Blvd., Suite I-350
Austin, Texas 78759 USA
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Tel: 512-794-0369
Fax: 512-794-3904
e-mail: ronh@hartcomm.org
www.hartcomm.org
Thank You for Your Attention!
HART is a registered trademark of the HART Communication Foundation
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